OG37.1-7,OG38.1-3 | Operative Observation Skills — Graded Quiz

Correct. In repeat LSCS, the bladder is often adherent to the lower uterine segment from previous surgery. Dense adhesions obliterate the natural tissue plane, making inadvertent cystotomy the most immediate intraoperative risk during bladder flap development. Recognition of loss of the tissue plane should prompt the surgeon to slow down, use sharp dissection under direct vision, and have the ability to repair a cystotomy if it occurs.

The adherent bladder in repeat LSCS is the single most dangerous anatomical finding at caesarean section. The observer should watch for: the surgeon slowing dissection, using sharp scissors under vision, asking for a bladder catheter to check for haematuria as an early cystotomy sign.

When the bladder is densely adherent to the uterine scar from previous surgery, inadvertent cystotomy is the immediate and specific risk at this step. Uterine artery injury and ureteric injury are also possible at other steps, but cystotomy is the most anticipated complication precisely at the bladder flap dissection stage in this scenario.

Correct. Absence of a cleavage plane at manual removal, particularly in the lower segment of a woman with prior uterine surgery, is the hallmark finding of placenta accreta spectrum (PAS). Forced manual removal in PAS causes catastrophic haemorrhage. The correct response is to stop manual removal, recognise the possibility of PAS, and proceed according to a pre-planned approach — which may include hysterectomy, conservative uterus-sparing surgery, or uterine artery ligation depending on the team's decision.

Placenta accreta spectrum (accreta → increta → percreta by depth) is increasingly common with rising CS rates. The observer should note risk factors: low-lying placenta + previous uterine scar. Intraoperative diagnosis: no cleavage plane. Response: do not force; pre-planning, senior involvement, and often peripartum hysterectomy.

Absence of a cleavage plane on manual placental removal, especially with a previous scar and placenta overlying the lower segment, is the classic intraoperative finding of placenta accreta spectrum. The critical action is to stop forced removal — persisting causes life-threatening haemorrhage.

Correct. The most vulnerable site for ureteric injury at hysterectomy is where the ureter passes under the uterine artery ('water under the bridge') at the base of the broad ligament, approximately 1.5 cm lateral to the cervix. This is the step immediately following uterine vessel ligation. Inadvertent crushing, clamping, or ligation of the ureter here causes intraoperative urine leak (or delayed fistula if the injury is unrecognised). Intraoperative recognition allows immediate repair.

Three sites of ureteric injury at hysterectomy: (1) pelvic brim as it crosses the iliac vessels; (2) beneath the uterine artery — the most common; (3) at the uterovesical fold where the ureter enters the bladder trigone. Intraoperative ureteric injuries should be repaired immediately; delayed diagnosis leads to fistula.

After securing the uterine vessels, the ureter is most at risk at its crossing point beneath the uterine artery (1.5 cm lateral to the cervix). This is the classic 'water under the bridge' injury site. Bladder injury is more common at the utero-vesical fold; pelvic brim ureteric injury occurs earlier during pedicle ligations.

Correct. Sudden loss of resistance with the curette sinking beyond the expected cavity depth is the classic sign of uterine perforation. Management depends on clinical status: if the patient is haemodynamically stable with no signs of peritoneal injury or bowel involvement, conservative management (stop procedure, observation, antibiotics, serial abdominal examinations) is appropriate. If there is bleeding, peritonism, or suspicion of visceral injury, laparoscopy or laparotomy is required.

Uterine perforation risk is highest with: retroverted uterus (failure to correct the angle), postmenopausal atrophic uterus (thin, friable wall), excessive force during dilatation. The observer should watch for: sudden resistance loss, unexpected instrument depth, and the surgeon's immediate response — stop + assess.

Sudden loss of resistance with the curette going beyond expected uterine depth = uterine perforation. This requires immediate cessation of instrumentation. Management is conservative (observation, antibiotics) for uncomplicated cases or surgical intervention if there is haemorrhage, peritonism, or visceral injury.

Correct. Two vacuum cup pop-offs constitute a failed vacuum delivery. Proceeding to forceps after a failed vacuum constitutes sequential instrumental delivery, which carries a significantly higher risk of neonatal intracranial injury. With a concurrent prolonged fetal heart rate deceleration, the safest course is to abandon instrumental delivery and proceed immediately to caesarean section. The decision to proceed to CS from a failed instrumental must be made decisively — not after multiple failed attempts.

Sequential instrumental delivery (vacuum then forceps) is associated with significantly increased neonatal intracranial haemorrhage and should be avoided except in exceptional circumstances. Failed instrumental delivery with fetal compromise = immediate CS. The decision point must be made early and definitively.

Two vacuum pop-offs = failed vacuum delivery. The correct response is NOT to switch to forceps (sequential instrumental delivery significantly increases neonatal injury risk) or to reapply. With a concurrent fetal heart rate abnormality, immediate caesarean section is the appropriate decision.

Correct. The Mauriceau-Smellie-Veit (MSV) manoeuvre is used to deliver the after-coming head in vaginal breech delivery. The operator places the infant's body astride the forearm, inserts two fingers of the same hand into the baby's mouth to apply jaw traction (flexing the head), while the other hand applies occipital pressure to maintain flexion — traction is applied in the correct axis. Forceps (Piper's) can also be used for the after-coming head in experienced hands.

Vaginal breech delivery manoeuvres: Lovset's (arms); Burns-Marshall or MSV (after-coming head). MSV applies jaw traction + occipital pressure to maintain head flexion. The Trendelenburg head-tilt must be avoided — the operator should not allow the trunk to rise above horizontal, which risks hyperextension of the after-coming head.

The Mauriceau-Smellie-Veit (MSV) manoeuvre is the standard technique for the after-coming head in breech delivery: the baby's body is supported on the operator's forearm, jaw traction flexes the head, and the other hand applies occipital pressure to maintain flexion. McRoberts is for shoulder dystocia, not breech.

Correct. Under the MTP Act 1971 as amended in 2021, a survivor of rape or sexual assault is one of the specified categories for which termination between 20–24 weeks is permissible. However, this requires the opinion of TWO registered medical practitioners who certify that continuation would involve a risk to the life of the woman or of grave injury to her physical or mental health. A court order is not required for cases within the Act's specified categories.

MTP Act 2021 key points: ≤20 wk = ONE RMP; 20–24 wk = TWO RMPs for defined categories (rape, minors, marital change, foetal anomaly, disability, humanitarian); >24 wk = State Medical Board only for substantial foetal abnormality. The woman's identity is confidential — disclosure is a criminal offence.

MTP Act 2021: rape/sexual assault survivors are an explicitly named category for 20–24-week termination. This requires TWO RMPs' opinions. A court order is only sought when the case falls outside the Act's defined categories — for this case within the Act, no court order is needed.

Correct. A mill-wheel (churning) murmur heard through the precordium immediately after insufflation, in association with sudden cardiovascular collapse, is pathognomonic of gas (CO2) embolism. Gas entry into the venous system (via an inadvertently cannulated vessel during trocar placement) creates a frothy mass in the right ventricle and pulmonary outflow tract. Management: immediately desufflate, place in left lateral decubitus Trendelenburg position, aspirate gas via central venous catheter if present, and support circulation.

CO2 gas embolism at laparoscopy: rare but life-threatening. Signs: sudden cardiovascular collapse + mill-wheel murmur + ETCO2 drop (paradoxical: initially rises then falls as output falls). Risk: Veress needle inadvertently placed in a vessel. Prevention: check Veress needle position before insufflation (aspiration, pressure test, drop test).

The mill-wheel murmur (churning sound on cardiac auscultation) combined with sudden cardiovascular collapse at the start of CO2 insufflation = gas embolism. This is the most feared laparoscopic complication. Immediately: stop insufflation, desufflate, left lateral decubitus + Trendelenburg, ventilatory support.

Correct. Absorption of the hypotonic distension medium (glycine 1.5%) through open venous sinuses of the endometrium causes dilutional hyponatraemia — the hysteroscopic fluid overload syndrome, analogous to TURP syndrome. Glycine is metabolised, leaving free water that dilutes serum sodium. The risk increases with operating time, high intrauterine pressure, and fibroid vascular beds. Confusion, nausea, bradycardia, and hyponatraemia (as low as <120 mmol/L) are the hallmarks. Management: stop procedure, restrict fluids, monitor and correct hyponatraemia cautiously.

Hysteroscopic fluid deficit should be monitored continuously. If deficit exceeds 1 L (glycine) or 2.5 L (normal saline/Hartmann's), the procedure must be stopped. Glycine-based media are more dangerous than saline media because glycine is osmotically active but metabolised, leaving free water. Modern saline-based systems (bipolar) reduce this risk.

Glycine 1.5% absorption via open endometrial veins during prolonged hysteroscopy causes dilutional hyponatraemia — the TURP syndrome equivalent. Prolonged operating time plus a vascular fibroid bed increases absorption. Monitor fluid deficit during hysteroscopy; stop if deficit exceeds 1–1.5 litres.

Correct. Late failure of tubal sterilization (occurring years after the procedure) produces a higher proportion of ectopic pregnancies compared to unsterilized women because the partially occluded tube may allow sperm but not a fertilised ovum to pass through normally. A positive pregnancy test with no intrauterine sac in a sterilized woman is an ectopic pregnancy until proven otherwise. This is a clinical emergency. The observer should know that sterilization failure risk is approximately 1 in 200 over 10 years (cumulative), with ectopic rate high among those who do conceive post-sterilization.

Sterilization failure: cumulative 10-year failure ≈1 in 200 (varies by method). When sterilization fails, ectopic pregnancy is disproportionately likely. Any post-sterilization pregnancy with symptoms or no intrauterine sac must be managed as suspected ectopic. The observer at sterilization must understand this counselling point.

Pregnancy after tubal sterilization with no intrauterine sac = ectopic pregnancy until proven otherwise. Late sterilization failures are disproportionately ectopic because partial tubal occlusion permits fertilisation but impedes tubal transport. This is a clinical emergency requiring urgent assessment.

Correct. A failed or inadequate pipelle aspiration in a postmenopausal woman with thickened endometrium (12 mm, suspicious for malignancy) requires an alternative method to obtain diagnostic tissue. The failure rate of pipelle aspiration reaches 10–15% (stenosed os, fibroid distortion, polyp, carcinoma with necrotic centre). Formal D&C under anaesthesia, or preferably hysteroscopy with directed biopsy, provides a better sample and also allows direct visualisation of the cavity to identify focal lesions that blind sampling may miss.

Endometrial aspiration (pipelle) has ~90% sensitivity for endometrial carcinoma when adequate tissue is obtained. In postmenopausal women with thickened endometrium and failed aspiration, hysteroscopy + directed biopsy is the preferred next step — it both visualises the lesion and obtains directed sampling, improving diagnostic accuracy.

A blood-stained empty pipelle from a postmenopausal woman with 12 mm endometrium is an inadequate sample in a high-risk context. Formal D&C or hysteroscopy with directed biopsy is required. Hysteroscopy is preferred because it allows direct visualisation and directed biopsy of focal lesions that blind sampling misses.

Correct. Bilateral salpingo-oophorectomy removes both ovaries, which are the main source of oestrogen in premenopausal and perimenopausal women. The abrupt cessation of ovarian oestrogen production causes surgical (iatrogenic) menopause. Symptoms — vasomotor (hot flushes, night sweats), urogenital atrophy, and mood changes — appear immediately post-operatively and are often more severe than natural menopause due to the abrupt (rather than gradual) oestrogen decline.

The observer should anticipate that any woman undergoing BSO will have surgical menopause regardless of age. The post-operative counselling must include discussion of vasomotor symptoms, HRT eligibility (contraindicated or used with caution in oestrogen-sensitive malignancies), and long-term bone density considerations.

Removal of both ovaries = immediate surgical menopause from acute oestrogen withdrawal. Unlike natural menopause (gradual decline), surgical menopause causes abrupt symptoms that are often more severe. HRT may be offered unless contraindicated by the underlying malignancy (e.g., oestrogen-receptor positive endometrial cancer — check oncology guidance).